X0303 4 2010-11-10 1 0001022345 MARINER ENERGY INC ME 0001351483 POLASEK DALTON F ONE BRIARLAKE PLAZA, SUITE 2000 2000 WEST SAM HOUSTON PARKWAY SOUTH HOUSTON TX 77042 0 1 0 0 Chief Operating Officer Common Stock 2010-11-10 4 F 0 95144 D 369434 D Common Stock 2010-11-10 4 D 0 369434 D 0 D Employee Stock Option (right to buy) 14 2010-11-10 4 D 0 102000 D 2008-03-11 2015-03-11 Common Stock 102000 0 D On November 10, 2010, 241,201 shares of the issuer's common stock granted to the reporting person under the issuer's Stock Incentive Plan, as amended and restated from time to time (the "Plan"), vested. To satisfy withholding tax obligations in connection with the vesting, the issuer withheld the shares this Form reports were disposed. In accordance with the Plan, the number of shares withheld was determined by reference to the closing price per share of the issuer's common stock on the New York Stock Exchange on November 9, 2010 of $26.50. Disposed of pursuant to an Agreement and Plan of Merger between Apache Corporation ("Apache"), Apache Deepwater LLC and Mariner Energy, Inc., dated 4/14/2010, as amended (the "Merger Agreement"), on 11/10/2010, the effective date of the merger (the "Effective Date"). Pursuant to the Merger Agreement, Mariner stockholders could elect to receive the following consideration: (i) all stock consideration of 0.24347 share of Apache common stock for each share of Mariner common stock, subject to possible proration, (ii) all cash consideration of $26.00 in cash for each share of Mariner common stock, subject to possible proration, and (iii) mixed consideration of $7.80 in cash and 0.17043 share of Apache common stock for each share of Mariner common stock (the "Mixed Consideration"). If no election was made, the stockholder will receive the Mixed Consideration for Mariner common stock. Apache announced it expects to announce final results of merger consideration elections on 11/12/2010. Pursuant to the Merger Agreement, this fully vested option was converted on the Effective Date into a fully vested option to purchase 24,833 shares of Apache common stock for $57.51 per share. Dalton F. Polasek by Scott D. Josey pursuant to Power of Attorney dated March 1, 2006 (previously filed as Exhibit 24 to Mr. Polasek's Form 4 filed on May 31, 2006) 2010-11-10